Apple Newton Utilities Guia do Utilizador descarregar pdf (Página 606)

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CHAPTER 16

Find

16-18 Using the Find Service

// We may also add slots here...

};

// Append myFinder frame to system’s results array

AddArraySlot(results, myFinder);

end;

Implementing the DateFind Method 16

Date-based searches have a lot in common with their text-based counterparts; in

fact the only signiﬁcant difference between these two operations is the search

criteria. Rather than matching a text string, the

DateFind method tests items

against a time value according to the value of the

findType parameter. This

parameter indicates whether the search should include results for items dated on,

after, or before a speciﬁed date.

You can simplify the implementation of date-based searches by time-stamping your

application’s data when it is stored. If you store application data as frames that hold

the time they were created or modiﬁed in a particular slot, the

DateFind method

simply tests the value of this slot to accept or reject the entry.

The sample code immediately following shows the implementation of a typical

DateFind method using the ROM_SoupFinder proto. This code assumes that

soup entries have a

timeStamp slot:

MyApplicationBase.DateFind :=

func(findTime, findType, results, scope, statusView)

begin

local myCursor ;

local querySpecFrame;

local querySpec;

local ourFinder;

local mySoup;

constant kOneDay := 60*24;

// report status to the user

if statusView then

statusView:SetMessage("Searching in " &

GetAppName(kAppSymbol) & $\u2026);

// Get the soup

mySoup:= RegUnionSoup(kAppSymbol, kSoupDef);

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